diff --git a/deploy/dokku.sh b/deploy/dokku.sh
index 6b239a4e..1c0d6100 100644
--- a/deploy/dokku.sh
+++ b/deploy/dokku.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 # This script used to automatically deploy dokku
 # global wildcard domain's certificate.